Bitcoin is the first cryptocurrency in history and the most popular in the world. Created at the turn of 2008-2009. Despite such a "respectable age", the cryptocurrency is actively developing, on the basis of the bitcoin blockchain, various solutions for its improvement are being developed and implemented. It was the appearance of bitcoin that caused such a rapid development of the cryptocurrency market and the regular appearance of a variety of digital assets. At the heart of bitcoin is the revolutionary blockchain technology, which has been actively researched and developed by the largest companies in the world for several years, and is also used in many industries.